Can't call callback with nodejs, aws lambda and aws api gateway

Question

I am having trouble making the callback in lambda to send a response in API Gateway. I am trying to build a simple application that interacts with a MySQL database. Relevent code snippet is below.

The issue is that even though validateToken will return an error and I will see the console.log message the done/callback will never send the expected response to the api gateway and will continue to process any code after it.

exports.handler = (event, context, callback) => { const done = (err, res) => callback(null, { statusCode: err ? '400' : '200', body: err ? err.message : JSON.stringify(res), headers: { 'Content-Type': 'application/json', }, }); if (event.path.match(/myApi\/workers\/*/)) { // Validate Token token.validateToken(pool, event.headers, function(err, result) { if (result.status == 'error') { console.log('Made it to here') done({"message": "Invalid api-token"}, null); } else { // Proceed with fetching workers } }); } }

Any help would be greatly appreciated!

Does the function work in the Lambda test console? How long does the function take to process? — Bob Kinney
– Bob Kinney, Commented Jun 12, 2017 at 14:11
It works as in it doesn't throw an error but it also doesn't return the "Invalid api-token" as it is expected to. I have been doing most of my testing through the API Gateway tester in the console. Ran a test through the Lambda one as well for this. — davis190
– davis190, Commented Jun 12, 2017 at 19:19
Sorry forgot to answer your "how long does it take to process" question. It currently times out since it doesn't ever return. — davis190
– davis190, Commented Jun 13, 2017 at 15:17

davis190 · Accepted Answer · 2017-06-13 16:47:48Z

Turn out my problem was the same that was posted here.

AWS Lambda function never calls the callback

I tried to simplify the code by removing the mysql part and didn't realize that was what was causing the issue.

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